Now you are thinking about the equipments needed, right? Yes remember as you have to make a lot of expeditions you can’t carry a lot of equipments with you. You have to try out with less expeditions and a lot of tricks. There are Telephoto Lens available on the market which is the idea for this type of photography but it is not possible to have such due to its high cost. Try to buy a lens that you can afford and try to select the highest millimeters in lens length. And now you will only have to look for tricks that will help you to take better photographs.